asterisk users - Jan 2014 - RTPAUDIOQOS - Depending on who hangs up the phone, it's empty

I'm having a problem pulling data from RTPAUDIOQOS.    For testing purposes
I have asterisk sending QOS data to the console.   It seems I get QOS data only
if the caller hangs up, with the variable being empty if the callee (or
asterisk) hangs up.
 
Any idea why I would see this?
 
exten => h,1,NoOp(RTPAUDIOQOS: ${RTPAUDIOQOS})

Thanks,

Richard Seguin
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